> My Neutral and Ground is connected at the main panel but also at
> the barn 300 feet away. I am running a 3 wire 100 amp 240v power 4 00
> aluminum line to the barn from a 100 amp 240v breaker located in my main
>distribution box. I didn't like the idea of a gnd neutral tie that far
>away from
> the barn, so I tied them together at the barn with a second ground rod
> located
>at the barn. Is that such a bad idea?
See NEC 250.32(A) and (B). Since your 3-wire system is existing, the 4-wire
requirement beginning with the 2008 NEC likely does not apply -- but may
under your local code. New detached structure wiring generally requires
4-wire service whether or not there is a continuous metallic path between
structures In no event should the neutral and ground come in contact again
from the feeder path to the barn's sub-panel (as it seems to exists now).
Being a detached building, the barn service entrance must be grounded/bonded
to its own grounding electrode or grounding electrode system in accordance
with Part III of NEC Section 250.
Paul, W9AC
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